Arrangement for time-resolved optical backscatter measurement at

Details Arrangement for time-resolved optical backscatter measurement at Arrangement for time-resolved optical backscatter measurement at

1987-07-20

1989-02-14

Evans, F. L.

Optics: measuring and testing

Optical pyrometers

With sample engaging rod or tube

374 31, 374161, 356301, 350401, G01J 508, G01N 2165

Patent

active

048042641

ABSTRACT:
A measuring apparatus for space-resolved temperature measurement by optical backscattering measurement at optical waveguides, wherein an improvement in the signal-to-noise ratio is achieved by including an additional filter device to attenuate the Rayleigh peak in the backscattered light. The filter device preferably includes a polarizing beam splitter, behind which a quarter-wave plate and an interference filter are disposed in the transmission direction.

REFERENCES:
patent: 3414354 (1968-12-01), Siegler, Jr.
patent: 4564931 (1986-01-01), O'Hara et al.
Dakin et al, SPIE vol. 566 Fiber Optic and Laser Sensors III, (1985) pp. 249-256.

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